Design of a Low Profile Archimedean Spiral Antenna using Compact Defected Ground Structure as a Reflector

Pub Date : 2023-08-31 DOI:10.14429/dsj.73.17751

Sukhdas Ahirwar, Amara Prakasa Rao, Mada Chakravarthy

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Abstract

In this paper, design and realisation of a low profile Archimedean spiral antenna is presented. The low profile Archimedean spiral antenna is printed on a substrate and backed by a reflector consisting of DGS. The DGS unit cell consists of a parallel combination of meander line inductors and inter-digital capacitors. This, DGS is one of the forms of electromagnetic band gap (EBG) structures providing electromagnetic band gap characteristics. It is used as a reflector with spiral antenna to achieve unidirectional radiation properties and a low profile of antenna. A modified version of uniplanar EBG cell is used as a DGS cell. This cell is used for configuration of the DGS ground plane. This ground plane is evaluated for its electrical characteristics and used as a reflector for the spiral antenna. Archimedean Spiral antenna is designed and simulated in the frequency band of 1-6GHz with DGS as a reflector. The antenna characteristics are studied for physical parameters of the antenna. These parameters are optimized for better electrical characteristics. The performance of the proposed antenna is also compared with conventional metallic (PEC) reflectors. Simulated results of an antenna are validated by measurement. Antenna height reduction of 60% is achieved compared to conventional cavity-backed spiral antennas.

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采用紧凑缺陷接地结构作为反射面的低轮廓阿基米德螺旋天线设计

本文介绍了一种低轮廓阿基米德螺旋天线的设计与实现。低矮的阿基米德螺旋天线被印在基板上，背面是由DGS组成的反射器。DGS单元电池由弯曲线电感器和数字间电容的并联组合组成。因此，DGS是提供电磁带隙特性的电磁带隙结构的一种形式。它作为反射面与螺旋天线配合使用，实现了天线的单向辐射特性和低轮廓。采用改进的单平面EBG细胞作为DGS细胞。该单元格用于配置DGS接地平面。该接地面的电特性被评估，并用作螺旋天线的反射面。以DGS为反射器，设计并仿真了1-6GHz频段的阿基米德螺旋天线。对天线的物理参数进行了研究。这些参数经过优化以获得更好的电气特性。该天线的性能也与传统的金属反射器进行了比较。通过实测验证了天线的仿真结果。与传统的腔背螺旋天线相比，天线高度降低了60%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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